Electric motor.



N. 0. LINDSTROM.

ELECTRIC MOTOR.

APPLICATION FILED AUG-I. I914.

Patented Feb. 15,1916.

2 SHEETS-SHEET I.

551 A Moazuaq anvowtoz N. O. LINDSTROM.

ELECTRIC MOTOR.

APPLICATION FILED AUG-1.1914.

1,171,964. Patented Feb. 15,1916.

2 SHEETS-SHEET 2.

19mm: 51mm z W wm THE cur-ulna PLANouRAPH cm. WASHINGTON, D, c.

UNITED STATES, PATENTOFFICE.

NILS o. LINDSTROM, 0E NUTLEY, NEW JERSEY, AssIGNQ TO ALONSO E. LEE, 0E"- BROOKLYN, NEW YORK.

' ELECTRIC MOTOR.

Application filed August 1, 1914." Serial No. 854,460.

This invention relates to-electric motors and more particularly to motors adapted for use with elevators and various forms of apparatus requiring a hoisting motor.

In the present construction ofhoisting motors, the common practiceis to rigidly mount the rotor and hoisting drum on a rotating shaft which is suitably supported at its ends in bearings carried by a supporting frame. Since'the hoisting drum is necessarily mounted adjacent one end of the shaft, the lateral pull resulting from the tension on thehoisting cable soon causes the shaft to work loose in itsbearings, resulting in a vibration of the parts which is highly objectionable. Moreover, if the bearings are not replaced in a comparatively short time, the rotating shaft may crystallize or the rotor thrown sufficiently out of alinement to strike the pole pieces or other stationary parts of the machine.

sustain the. stresses incident to the load to which the motor is subjected and the aim of this invention is to provide a mounting which will overcome these objections and which is of a simple, compact and practical construction.

With these objects in view, the invention consists of a stationary" shaft which is rigidly supported on standards or pedestals bolted to abed-plate'. Mounted for rotation on the stationary shaft is a sleeve which is properly supported by suitable anti-fric tion devices. This sleeve carries the rotor,

the hoisting drum and other rotating parts i so that the lateral pull on the shaft resulta ing from the load on the hoisting drum instead of being transmitted to a rotating part as in the present construction, is'carried by the stationary rectangular frame which may readily be made sufficiently rigid to sustain.

the same and as the shaft does not rotate,

any danger of it working loose-in its bear ings is eliminated; 1 a

The invention also consists of the combi- These and other .ob-f jections make the present supporting structure for the rotating parts inadequate to nations and constructions which will be" hereinafter described and particularly pointed out 1n the appended claims.

In the accompanying drawings: Figure l is a side elevation partly in section of an electric motor embodying the features-of my invention; and Fig. 2 is a. central vertical longitudinal section of Fig.1.

A hollow cast iron bed-plate 1, which is of the usual construction, is suitably supported on channel irons2 to which it is" secured by the I-bolts 3, the lower ends of whlch are provided with eyes into which transverse bolts 4 passing through the channelarons fit, while the upper ends are suitably threaded to receive-nuts, 5. Up-right Specificationof Letters Patent. P tent d 15,1913

standards or p'edestals7, are rigidly secured to the bed-plates by the bolts 8, the abutting surfaces of the standards and-bed being fin-' islied to provide smooth flat surfaces so that the standards will be immovably maintained in position. These standards, as

shown, are substantially tri-angular in shape and at their upper ends are provided with hubs having circular apertures 9 of a size" to receive the ends of a stationary shaft 10,

which snugly fits into the same and is rigidly held in place by set screws 11, The station ary shaft is of relatively large diameter and together with the up-right standards and bed-plate, form a. rigid rectangular frame,. which will sustain without any. relative movement the component parts,fthe stresses and strains to which it is subjectedtby theload carried by the revoluble members entire length between the standards 7 and is provided with a plurality of ribs 13, two

of the'motor, as will be hereinafter referred of which are shown in Fig. 2 of the draw- 7 mg. The rotor, wh ch in the direct'current machine shown, constitutes the armature,

comprises a lamina-ted "core 14; of the usual construction, having the. armature coils I5 suitably secured in peripheral slotstherein. The laminations are securely fastened between clamping end rings or plates 16 and 17, and-fare made fast to the sleeve 12, by. means of keys 18, fitting in suitable key ways out in: the core and in a plurality of the ribs, "onlyoneof such keys, however, being shown, the plate '16 resting against a shoulder formed upon the ribs 13, while the end plate 17 is secured to the end surfaces of these ribs by means of bolts 19. Suitably supported upon the right-hand end of the sleeve 12 is the usual form of commutator comprising segments 20 which are connected to the coils of the armature and which are in electrical contact with brushes 21 in the usual manner. The left-hand end of the sleeve 12 is of increased thickness and has projecting therefrom a laterally extending flange 22. A hoisting drum 23 and brake drum 24, which arev preferably made integral, fit over the flange 22 and are secured in place by means of the'annular flange 25, projecting inwardly from the drum which abuts against theend surface of the sleeve and towhich it is secured by means of the bolts 26, The inner surfaces of the ends of the sleeves are recessed to form annular recesses into which roller bearings of the usual construction are fitted, the bearings comprising rolls 27 which are held suitably spaced apart by the rings 28 and are adapted to ride upon the race'ways 29 and 29. To

lubricate the rolls centrally disposed conduits. 30extend inwardly from the ends of the shaft and are connected with transverseconduits 31 which lead. to the rollers, while threaded in the ends of the conduits are oil cups 32. Collars 33 provided with upstanding flanges 34 abut the outer ends of the roller bearings against which they are maintained by springs 35 interposed between the collars and annular rings 86, which. are held in place by caps 37 carried by the ends of the sleeves. A washer of fiber or like material is preferably interposed between the cap and the ring to prevent the leakage of.

oil.

The construction described constitutes the important features of my invention, for by 5 providing a loose sleeve surrounding a stationary shaft which is rigidly supported by a suitable frame and mounting the rotor and the hoisting drum, as well as the brake band upon this sleeve, while interposing between the ends of thesleeve and the stationary shaft, suitable anti-friction devices, a constructionis obtained. which will readily sustain the armature and other revoluble members of the combination against any angularl thrust or movement and the gyrations of the shaft which have heretofore occurred, due to the ends of the shaft-working loose in their bearings, is entirely eliminated. It-

which is sufficiently strong to sustain the angular thrusts or movements to which the same are subjected through the sleeve, but

even should the angular thrust be sufficient to draw the standards 7 somewhat out of their. perpendicular position, the same would not be as objectionable as if a rotating shaft works loose in its bearings, 1.

since the shaft is stationary and there will mounted upon the bed-plate, the bed-plate being suitably finished as at 40 in order to'form, a solid bearing for the frame. 7

Bolted to the annular frame are the pole pieces 41 which carry the usual field coils 42, the annular frame being adjustable with respect to the armature by means of thead ust-mg bolts or screws 42 which .arecommonly utilized to correctly position the faces of'the pole-pieces concentric to the axis of rotation of the armature; Suitably secured to the upper end of the field frame, isthe brake coil 43 which carries the usual form; of circuit'breaker 44, the brake coil being adapted through its cores and links 45 and 46' to release-the brake shoes 47, only one of which is shown, whichshoes are normally spring-pressed againstthe brake band by.

means of the compression springs 48, one

end of which bears against. the linkv 46 while the other end rests against a washer 49, carried by a stationary rod. 50 secured;

to the annular frame '38.

Having claim described my invention, II

1. In an electric hoisting motor, a stationary shaft, a supportingstructure therefor, comprising a base and two standards 7' into which theends of the shaft-fit, means for securing the ends of the shaft in said standards, a sleeve,- revolubly mounted on said shaft, and a rotor and hoisting drum rigidly mounted on Said sleeve.

2. 1111 an electrlc, hoisting motor, a-stae tionary'shaft, a supporting structure therefor, said shaft being of reduced diameter adjacent one end thereof,.a sleeve loosely: surrounding said shaftxand roller bearing.

interposed between said shaft and sleeve,

said'roller bearing atthe large end of the L shaft beingof greater size, and a rotor and hoisting drum rigidly mounted on said sleeve, said drum. being in alinement with the larger set of roller bearings.

' 3. Inan electric hoisting motor, a. stationary shaft, a supporting structure therer for comprising abase and two standards into which the ends of the shaft fit, means for securing the ends-of the shaft in said standards, a sleeve revolubly-mounted on;

, said shaft, and a rotor, hoisting drum, and

brake drum rigidly mounted on said sleeve.

4. In an electric hoisting motor, a stationary shaft, a supportlng structure therefor comprising a base and two standards mutator being disposed over the reduced end of the shaft and said drum over the other larger end thereof.

6. In an electric hoisting motor, a base, an annular field yoke supported above said base, a stationary shaft, uprights mounted on said base and rigidly supporting said stationary shaft, a sleeve rotatably supported on said shaft, and a rotor and hoisting drum mounted on said sleeve.

7. In an electric hoisting motor, a base, i an annular field yoke supported above said base, a stationary shaft, uprights mounted on said base rigidly supporting said shaft, a rotor, hoisting drum and brake drum mounted on said sleeve, said brake and hoisting drums being disposed to one side of said annular yoke, and brake shoes carried by said annular yoke adapted toengage said brake drum.

In Witness whereof, I subscribe my signature, in the presence of two Witnesses.

NILS 0.LINDS"1 ROM.

Witnesses:

WALDO M. CHAPIN, J'U'LE ZELENKO.

' Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

It is hereby certified that the name of the assignee in Letters Patent No.

1,171,964, granted February 15, 1916, upon the application of Nils O. Lindstrom, of Nutley, New Jersey, for an improvement in Electric Motors, was erroneously written and printed as Alonso B. Lee, Whereas said name should have been Written and printed as Alonso B. Sec, as shown by the records of assignments in this ofiiee; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 29th day of February, A. D., 1916.

[SEAL-1 R. F. WHITEHEAD,

Acting Commissioner of Patents. Cl. l72152. 

